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Do all electromagnetic waves travel at 299792458 m / s?

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Do all electromagnetic waves travel at 299792458 m / s?

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  1. Yes, in vacuum


  2. yes it is one of the properties of E.M waves


  3. Not in general, but they all do in a vacuum.

    Just as an example, light traveling at different speeds is what gives different objects different indexes of refraction (that is why water bends light).
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